$900 Budget - Please make sure everything is compatible

You should get an AM3 CPU. Here's a nice combo deal.

http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... $217.98 - $10 MIR (AMD Phenom II X4 945 Deneb 3.0GHz + Gigabyte GA-MA770T-UD3P combo)

You can get CAS 7 DDR3 1600 RAM for $10 more than the DDR3 1333 CAS 9 RAM you picked.

G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRM - Retail $114.99

Thanks for the tip, I switched some things around. I am guessing everything looks compatible? Thats really a big concern of mine for some reason.

I don't see what changes you made. No, an AM2+ CPU is not compatible with an AM3 motherboard. It will all be compatible if you use the motherboard/CPU combo I linked to above.

You can get a better PSU for less money.

Antec TruePower New TP-550 550W 80 PLUS BRONZE Certified Active PFC Power Supply $89.99 - $20 MIR

I made the changes on my end, I did not update my original post.

OK. Everything is compatible as long as you switched the CPU for the AM3 version.

i would suggest this combo for power supply and case http://secure.newegg.com/Shopping/ShoppingCart.aspx?sub...

if you can't see wat it is, it is the haf 922 and power supply combo

Your link doesn't work, it just takes me to my own shopping cart. You should just post a link to the combo.

I would suggest the AMD Phenom II x4 955 BE. No point in buying a 940 since the 955 uses a newer chipset, and performs better for $165. Go with the i5 if you're looking for performance not only in games. TBH I don't see why you would need to spend $115 dollars on RAM when you can get a nice pair of sticks for $90 (Prices change very often). I mean, sure you can go ahead and buy RAM with tighter timings, but I'd rather go with a cheaper pair that'll get the job done just fine.
The rest looks fine, I'd go with a OCZ or Corsair PSU over any Antec though. Not to mention that there are better options IMO over the NZXT case. Just go with a Coolermaster HAF 922/Antec 900/Antec 300/Coolermaster 690 or some other coolermaster case like everyone else. Not saying that the NZXT is crap though, as long as it has all the features you need at a cheaper price.